{"id":32467,"date":"2020-08-04T10:47:47","date_gmt":"2020-08-04T14:47:47","guid":{"rendered":"https:\/\/www.fondriest.com\/news\/?p=32467"},"modified":"2021-10-30T11:19:57","modified_gmt":"2021-10-30T15:19:57","slug":"eradicating-great-lakes-sea-lamprey-an-impossible-dream","status":"publish","type":"post","link":"https:\/\/www.fondriest.com\/news\/eradicating-great-lakes-sea-lamprey-an-impossible-dream.htm","title":{"rendered":"Is eradicating Great Lakes sea lamprey an \u201cimpossible dream?\u201d Researchers say no"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">The sea lamprey\u2019s days in the Great Lakes could be numbered.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">That\u2019s according to one researcher who took one of the first scientific looks at the possibility of sea lamprey eradication in the Great Lakes.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">So, can you remove enough sea lamprey to make them disappear?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cWell the answer is we already have,\u201d said Michael Jones, emeritus professor of fisheries and wildlife at Michigan State University. \u201cThen there\u2019s the obvious question: Why are they still here?\u201d\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">While multiple gaps in current management techniques, like sea lamprey poisons called lampricides, could account for sea lamprey\u2019s persistence in the Great Lakes, new technology could help sea lamprey managers eliminate inaccessible populations.<\/span><\/p>\n<h3><span style=\"color: #808080;\">Six requirements for eradication<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">There are six requirements to successfully eradicate a species, said Jones, who published his research raising the possibility of sea lamprey eradication in <\/span><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0380133020300897\"><i><span style=\"font-weight: 400;\">Journal of Great Lakes Research<\/span><\/i><span style=\"font-weight: 400;\"> in May<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">He focused on the first of the six criteria: It must be possible to remove a species faster than it reproduces.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">To gauge this, Jones looked at Lake Michigan, relying on research that said the lake\u2019s sea lamprey population had reached 1.3 million before the advent of lampricide.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The estimated current population of 100,000 sea lamprey means that current control measures have removed 92.3% of the population possible without any kind of control. <span class='bctt-click-to-tweet'><span class='bctt-ctt-text'><a href='https:\/\/x.com\/intent\/tweet?url=https%3A%2F%2Fwww.fondriest.com%2Fnews%2F%3Fp%3D32467&#038;text=The%20researchers%20estimated%20that%20an%20exploitation%20rate%20of%2090.3%25%20of%20sea%20lamprey%20would%20result%20in%20a%2097%25%20chance%20of%20eradication.&#038;via=FondriestEnv&#038;related=FondriestEnv' target='_blank'rel=\"noopener noreferrer\">The researchers estimated that an exploitation rate of 90.3% of sea lamprey would result in a 97% chance of eradication. <\/a><\/span><a href='https:\/\/x.com\/intent\/tweet?url=https%3A%2F%2Fwww.fondriest.com%2Fnews%2F%3Fp%3D32467&#038;text=The%20researchers%20estimated%20that%20an%20exploitation%20rate%20of%2090.3%25%20of%20sea%20lamprey%20would%20result%20in%20a%2097%25%20chance%20of%20eradication.&#038;via=FondriestEnv&#038;related=FondriestEnv' target='_blank' class='bctt-ctt-btn'rel=\"noopener noreferrer\">Share on X<\/a><\/span><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Despite an exploitation rate well above that assumed needed for eradication, sea lampreys persist throughout the Great Lakes.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">It\u2019s likely other criteria for eradication are not being met, Jones said.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">To rid the Great Lakes of sea lamprey, new individuals must be stopped from migrating in.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">It\u2019s uncertain whether or not new sea lamprey are coming into the Great Lakes, Jones said. But even without new lamprey entering from outside, migration between lakes could recharge populations in any one lake.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cThe only way it\u2019s possible is if you target all the lakes,\u201d he said.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Similarly, managers must be able to target even elusive populations which is not always possible.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cThere are sources of lampreys that are not very vulnerable to the methods of control that we currently use,\u201d Jones said.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The most common lampricide, called TFM, works best in flowing water and treatments usually target larvae in streams used as spawning locations.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">But, lamprey that live in wide, slow-flowing places like Lake St. Clair are difficult to reach with TFM, which will dilute too much in slow moving water. Another lampricide, bayluscide, can be used to coat sand, which is then sunk to the bottom of slow-moving water where it releases over time, providing an option for these difficult to reach populations, according to the Great Lakes Fishery Commission.\u00a0<\/span><\/p>\n<div id=\"attachment_32471\" style=\"width: 610px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-32471\" class=\"size-large wp-image-32471\" src=\"https:\/\/www.fondriest.com\/news\/wp-content\/uploads\/2020\/08\/Sea_lamprey_03-600x450.jpg\" alt=\"sea lamprey eradication\" width=\"600\" height=\"450\" srcset=\"https:\/\/news.fondriest.com\/wp-content\/uploads\/2020\/08\/Sea_lamprey_03-600x450.jpg 600w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2020\/08\/Sea_lamprey_03-300x225.jpg 300w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2020\/08\/Sea_lamprey_03-768x576.jpg 768w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2020\/08\/Sea_lamprey_03.jpg 940w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><p id=\"caption-attachment-32471\" class=\"wp-caption-text\"><span style=\"color: #808080;\">Sea lamprey larvae wash up on the shore of the Manistee River after a successful lampricide treatment. (Credit: R. McDaniels, Great Lakes Fishery Commission)<\/span><\/p><\/div>\n<p><span style=\"font-weight: 400;\">The current goal of sea lamprey treatment is not eradication, but control, a goal that seems to be met.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cThe sea lamprey program has been pretty successful thus far and they\u2019re pretty comfortable with where things are,\u201d Jones said.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The Great Lakes Fishery Commission calls the control program a remarkable success and \u201cthe only example in the world of a successful aquatic vertebrate pest control program at an ecosystem scale.\u201d<\/span><\/p>\n<p><span style=\"font-weight: 400;\">But, new control technology could soon bring eradication within reach.\u00a0<\/span><\/p>\n<h3><span style=\"color: #808080;\">New technology fits the bill<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Genetic biocontrol is a new field of research that involves releasing genetically manipulated individuals of a species into the wild in order to reduce the wild population.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In one of several possible methods, researchers could sterilize male sea lamprey and release them into the wild where they would compete with fertile male lamprey for mates. Any mating that involves a sterile male will, obviously, result in no new lamprey larvae, driving the population down.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">These sterile males could be tools for reaching populations unreachable with lampricides. Chemically sterilized male lamprey <\/span><a href=\"https:\/\/www.fws.gov\/fieldnotes\/regmap.cfm?arskey=27272\"><span style=\"font-weight: 400;\">already have been used in this way<\/span><\/a><span style=\"font-weight: 400;\">, notably in the St. Marys River between Lake Superior and Lake Huron.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Techniques like this have been discussed for targeting <\/span><a href=\"https:\/\/www.geneticbiocontrol.org\/\"><span style=\"font-weight: 400;\">invasive rodents which threaten<\/span><\/a><span style=\"font-weight: 400;\"> island ecosystems and <\/span><a href=\"https:\/\/www.nature.com\/articles\/d41586-019-02087-5\"><span style=\"font-weight: 400;\">disease bearing mosquitoes<\/span><\/a><span style=\"font-weight: 400;\">, though ethical concerns remain. Before any of these techniques are used widely, the risks of temporarily increasing an invasive species\u2019 population, even with sterile individuals, must be fully considered.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Jones thinks it\u2019s time to start that conversation.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cThe technology will very soon be with us and the real debate is going to be the ethical questions and pragmatic questions of deployment,\u201d he said.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Advances in an older technology\u2014dams\u2014could improve sea lamprey control, too.<\/span><\/p>\n<div id=\"attachment_32470\" style=\"width: 610px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-32470\" class=\"size-large wp-image-32470\" src=\"https:\/\/www.fondriest.com\/news\/wp-content\/uploads\/2020\/08\/Sea_lamprey_02-600x416.jpg\" alt=\"sea lamprey eradication\" width=\"600\" height=\"416\" srcset=\"https:\/\/news.fondriest.com\/wp-content\/uploads\/2020\/08\/Sea_lamprey_02-600x416.jpg 600w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2020\/08\/Sea_lamprey_02-300x208.jpg 300w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2020\/08\/Sea_lamprey_02-768x532.jpg 768w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2020\/08\/Sea_lamprey_02.jpg 940w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><p id=\"caption-attachment-32470\" class=\"wp-caption-text\"><span style=\"color: #808080;\">Sea lamprey attached to a salmon caught in northern Lake Huron. (Credit: M. Gaden, Great Lakes Fishery Commission)<\/span><\/p><\/div>\n<p><span style=\"font-weight: 400;\">Because sea lampreys require rivers and streams to spawn, dams that block their migration keep them from expanding their range in certain streams. As dams age and people advocate for free flowing rivers, researchers are seeking new solutions that allow free passage upstream for native species while blocking sea lamprey.<\/span><\/p>\n<p><a href=\"http:\/\/www.glfc.org\/fishpass.php\"><span style=\"font-weight: 400;\">FishPass<\/span><\/a><span style=\"font-weight: 400;\">, soon to be constructed in Traverse City, Michigan, is a barrier that allows researchers to study fish and sea lamprey passage through a variety of barriers and sorting techniques.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cOnce optimized for bi-directional (upstream and downstream) selective fish passage, FishPass will be converted to a permanent selective fishway,\u201d the Great Lakes Fishery Commission reports.<\/span><\/p>\n<h3><span style=\"color: #808080;\">The end of a costly invasion?<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Advances in barriers and genetic biocontrol could be tools that shift a very successful sea lamprey control program into an eradication program.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The final two requirements for eradicating an invasive species are that the value of eradication is greater than control and that society and government are in favor of eradication.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Lamprey control costs millions of dollars each year and the most effective methods of control\u2014lampricides and barriers\u2014\u201care both extremely vulnerable to a shift in the public opinion pendulum away from support for their use,\u201d he said.\u00a0<\/span><\/p>\n<p><a href=\"https:\/\/advances.sciencemag.org\/content\/5\/9\/eaau8462.abstract\"><span style=\"font-weight: 400;\">Research that Jones published in 2019<\/span><\/a><span style=\"font-weight: 400;\">, shows that the public supports at least research into the issue.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">There is still no guarantee that sea lamprey can be eradicated even with new technology and continued public support. An eradication of an invasive species through an area the size of the Great Lakes has never been achieved.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cThere have been many, many successful eradications, but most of them have been on tiny islands and not in the largest lakes in the world,\u201d Jones said.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">But, while it\u2019s not a guarantee, Jones and his coauthor write in their study \u201ceradication of sea lampreys should not be considered an impossible dream.\u201d<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sea lamprey control in the Great Lakes has been a success. Is eradication possible?<\/p>\n","protected":false},"author":37,"featured_media":32472,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,5,458,32,7],"tags":[2205,60,2202,2203,125,119,2201,2204,224,2200],"class_list":["post-32467","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aquatic_species-htm","category-featured-articles","category-fish-science","category-lakes-reservoirs","category-news","tag-eradication","tag-featured","tag-fish-barriers","tag-genetic-biocontrol","tag-great-lakes","tag-invasive-species","tag-lampricide","tag-michael-jones","tag-michigan-state-university","tag-sea-lamprey"],"remote_post_permalink":false,"remote_post_featured_image":false,"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Is eradicating Great Lakes sea lamprey an \u201cimpossible dream?\u201d Researchers say no<\/title>\n<meta name=\"description\" content=\"Sea lamprey control in the Great Lakes has been a success. 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